Portion of display panel with a graphical user interface



The sole FIGURE is a front view of a portion of a display panel with a graphical user interface, showing the new design.

The outermost broken line illustrates a display panel and forms no part of the claimed design. The remaining broken lines, including all text, illustrate portions of the graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for a portion of display panel with a graphical user interface, as shown and described. 